Control apparatus



H. BREWER.

CONTROL APPARATUS.

APPLIQATION min FEB.14. 1919,

1,'356,8Q4. Patented 0@;. 26,1920.

J- E i;

MENTOR My. 65%

A 4 ATTORNEY NIT s'rArEs PATENT OFFICE.

HENRY BREWER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO LEEDS & NORTHRUP COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION 7 OF PENNSYLVANIA.

CONTROL APPARATUS.

Patented Oct. 26, 1920.

1 Application filed February 14, 1919; Serial No. 276,975.

To all whom itmay-ooncem: Be it known that I, HENRY BREWER, a c1t1- zen ofthe United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented certain new and useful Improvements in Control Apparatus, of which the following is a specification. My invention relates to a system of or apparatus for effecting any suitable control, as temperature control, for producing indicationsof the effect-produced by the control, andfor recording the variations, as of'temperature, effected by the control. My invention resides in apparatus, which may-be 'in the nature of recording a'ppa-- ratus or with which a recorder may be 00- operatively associated, which controls a circuit or circuits foreffecting' any-suitable or desirable operation, as the control of one or more translating devices, and; preferably such as may be employed for controlling temperature, I the apparatus comprising structure which is in turn responsive to or controlled by the change in temperature or other condition effected by the translating device or devices, and particularly when a Wheatstone' bridge, potentiometer, or any other equivalent or suitable arrangement is employed in association with a galvanometer to effect the control.

My invention resides in apparatus, comprising similar structure, which' controls indicating or signaling means, especially when responsive to a change in temperature or other condition effected by the aforementioned control apparatus.

My invention resides also in apparatus of the character referred to in which the galvanometer which effects the controls or indications also controls mechanism for recording the variation or change with time of the temperature or condition effected by the aforementioned control apparatus.

l\. [v.invention resides iii-apparatus of the character hereinafter described.

For an illustration of one of numerous forms my invention may take, reference may be had to the accompanying drawing, in which:

Figure 1 is a perspective view of structure embodying my invention.

Fig. 2 is a diagrammatic view illustrating Referring to the drawing,

part of the structure shown in Fig. 1, together with indicating means, controlling means, and associated electrical circuits.

- Inthe illustrated example of my apparatus parts thereof and theii 'mode of operation are similar to those disclosed in prior Letters Patent of the United States to Leeds No. 1,125,699, January19, 1915, my-invention'comprehending'but not being limited to their employment: 1 M is an electric motor, .or any other suitable source of power, which rotates the shaft 1, preferably at substantially .constantspeed, which in turn drives the .worm'2 meshing with and driving the worm gear 3 secured upon the shaft 4. Pi'voted 'near its upperend is a lever 5 back 'of which and pivoted upon lever 5 on a horizontal axis is the arm .6 on each end of which-is a shoe 7 of cork or other" suitable material frictionally engaging the rim 8 of the clutch disk or wheel 9 secured upon the shaft 10; Secured upon the shaft4 is a cam 11 which periodically engages the lever or member 5 and moves it outwardly away from the disk 9 in opposition to a spring, not shown, thereby lifting the shoes 7 free from the rim 8 of clutch disk 9, the afore-. said spring returningthe shoes 7 into engagement with the rim 8 after predetermined rotation of the cam 11. Upon the shaft 4. is secured a second cam 12 which, after the cam 11 has lifted the shoes 7 from rim 8, actuates the end of finger 18 on the lower end of the arm 14 secured at its upper end to the member 15 pivoted at 16. Upon the frame or member 15 is secured the member 17, whose upper edge 18 is inclined and increases in height from the center toward each side. Disposed immediately above the edge 18 is the needle or pointer 19 of any suitable measuring or indicating instrument, as for example, a galvanometer of which 20 is the movable coil or element which swings or deflects the needle or pointer 19. At opposite ends of the member 17 are the abutments 21 for limiting the deflection or swing of needle 19. Directly above the needle 19 and beneath which it normally freely swings are the edges 22, preferably straight and horizontal, upon members 23, 23 pivoted at 24:, 24, and extending toward each other,

leaving a gap of suliicient width between their inner ends-to allow the .free entry of ends of members 25, 25. :At opposite ends of the arm are the ears or lugs 29, 29 adapted to 'be engaged by the cams 30,-30:similar in shape and similarly positioned and secured upon the shaft 4.

Secured upon 'theshaft 10 is a dlSlCOl wheel 31 of insulating material carrying upon its periphery the resistance conductor '1 R. which may be disposed in the form of a helix laid upon the wheel-31. Engaging the resistance R is the =stationary-='contact 32. The disk 31 may be securedto the shaft 10 in any suitable angular relation with respect thereto by the set'screw 33 threaded through 'the imb 34 through which the shaft 10 extends. Secured upon the shaft 10 is a second wheel or disk-35'canying'the arcuate contacts "36 and 37 insulated lfrom each other and preferably from the 'remainderof'the apparatus. The disk 35is held in any suitable angular 'position'upon the shaft 10 by the screw 38 threaded through the hub 39through which the shaft 1.0 passes.

Upon the shaft 10 is similarly secured by screw '40-and hub 41 'a'third disk 42 carrying the 'arcuate contacts 43, fll and '45, all insulated from each other and preferably from the remainder of the apparatus.

\Vhile separate disks 31, 35 *and 42 are shown, it will be understood 't'hat these-'disks or any two of them may be one and "the same unitary structure "w'hereby the differout groups of contacts mentioned maybe rotated in unison by'theshaft '10 and maybe adjusted in unison with each other as to angu'lar position uponthe shaft 10, particularly with respect to the point of engagement "between contact 32 and resistance R on disk 31. I

Secured upon the shaft 10 is 'thegrooved prilley or wheel 46 around which passes the cord 47 which passes over suitable pulleys 4:3 and is secured to the marker or recorder teeth or ins upon the "periphery of the roller 52, secured upon the shaft 53 which is driven by the A motor M through the worm 54,-gear 55, s'haft56, worm57'and gear 58.

In;the particular electrical system'o'f control of the galvanome'ter'coil 20, 'a potential circuit is employed, which, however, may be replaced by any other suitable circuit arrangement. For example, "the galvanometer coil may be connected directly in simple circuit with a source of current and a resistance thermometer or other device,

or directly in circuit witha thermo-couple.

In the potentiometer circuit the contact :32 is connected by conductor 59 with one battery and one terminal :of'tthe 'resistsince 64 aconnection is made through the standard cell S with :a switch contact '68 into contact with which the switch lever 62 may be thrown, when it is desired to readjust or calibrate the potentiometer. In the normal operation o'f'lthe apparatus, however, the switch lever '62 remains in engagement with 1 contact 61.

onductors 69 and 70 connect with any suitable source of current, the conductor 69 communicating with one terminal "of each 'o'fthe indicating lamps orrany other suitable signal 'orindicating means '7, 'w and 'b, which may "be, respectively, red, white and blue incandescent lainps whose other terminals connect, respectively, with contacts 45, 44 and '43 upon the disk 42. The conductor 70 connects with two brushes 71 and -72, spaced 'fromeach-other circumferentially of the disk 42 somewhat 'more than the distance between the contact 44 and'the adjacent contacts 43 and 45.

F is a furnace or other structure which, according to 'one example of an embodiment 'of my invention, is to be controlled as to its temperature. In the-'example illustrated heat is supplied to the furnace by a main resistor 73 whose'te'rminals are'connected'to the conductors 74 -and 7 5, which in turn connect to any suitable source of current, which may be the same source of current to which the conductors '69 and '70 connect. The auxiliary resistor 76 hasits one terminal connected to'conductor and its other terminal to conductor 77, which the coil 79, which in turn is connected to' the contact 37 on disk. 35, the companion contact 36 being connected-to one terminal of the coil 80, whose otherterminal connects to the conductor 77. Associated with the contacts 36 and 37 is the brush or stationary contact ,87, which connects with supply conductor. 75. I

The mode of operation is as follows:

Supposing the temperature of the furnace F to be above that desired, the thermo couple T will produce an electro-motive force greater than that which produces balance I in .the potentiometer circuits, and the galvanometer coil 20 is therefore'energized and deflects its ,n'eedle19 toward the right, Fig. '1, whereby dueto the periodic vertical movement of the member 15 by cam'12 the needle 19 is clamped between the inclined edge 18 and the lower edge 22 of the right hand member 23, 'causingthe arm 25 to be tilted in a clockwisedirection about its pivot 24, thereby pushing on the right hand: pin 28 on plate 27, and'so tilting the -movable or driving clutchmember or arm 6 in a clockwise direction, while cam 11 is holding shoes 7, 7 from the rim 8 of clutch wheel9, the

angular movement of the member 6 being dependent upon the degree of deflection of the galvanometer needle 19. The cam 11 soon allows the shoes to again grip the rim 8 of the wheel 9 and soon'thereafter the left hand cam 30 engages the ear'29, which has now bcenclevated, pushing it downwardly, due to rotation of shaft 1, restoring it to the horizontal position indicated, but in so moving back to normal position the clutch member 6 rotates the clutch disk 9 in a counter-clockwise direction, similarly rotating the disks 31, 35 and 42. The action is such as to move the potentiometer resistance R with respect to contact 32 in such direction as to tend to restore balance of the electromotive-force in the potentiometer to or to-v ward equality with the electro-motive-force produced by the thermo-couple T. But this counter-clockwise movement implies that contact 87 is in engagement with contact 36, thereby energizing relay coil 80, which moves the core structure 81 in such direction as to separate bridging contact 83 from contacts 82 and 78 and to bring bridging contact 84 into engagement with contacts 85 and 86. Due to separation of contact 83 from contact 78 the circuit of coil 80 is broken and the circuit of auxiliary heater 76 is also broken so that the temperature of the furnace will descend. During further stepmovements of shaft 10, in a counterclockwise direction, controlled by the galvanometer needle 19 under control of the so varied resistance of .R, a condition will sooner or laterbe reached where the temperature of the furnace is at or near the desired temperature, in which case the electromotive-force produced by the thermo-couple T will be less than before and such that it is substantially equal to the electro-motive- 75 force'fall in the potentiometer circuits, and

accordingly there will be no deflection of the galvanometer needle 19, which then remains in the free'space between the members 23,23, and the periodic or successive upward movements of the frame 15 produce no effect as to setting the clutch member 6.

Should the temperature of the furnace fall too low .for any reason, the electro-motive-forcew produced by the thermo-couple T will be stilllowerthan before, with resultant deflection of galvanometer needle 19 toward theleft, causing a clockwise movement of 'the disk 9 and shaft 10 by mode of operation similar to that above described. This willbring :brush' 87 into engagement with contact 37, whereby relay -coil 79 will be'energ'ized, causing the core structure to return to the position illustrated, whereupon the auxiliary resistor 76 isagain brought into circuit, tending again to raise the temperature of the furnace. I

The lamps or other indicators 1", w and Z2 may be located at any desired point, either near the recorder structure or near the furnace, or both, in which latter case the lamps are duplicated and connected in parallel with each other.

When the temperature of the furnace is that desired, the lamp controlling contacts are in the osition indicated in Fig. 2. In this case tlie white light to only is glowing, the same being energized from conductor 70 through either or both brushes 71 and 72, contact 44, lamp w, to conductor 11!).

69. This indicates that the furnace is at or quite near the desired temperature. Should the temperature of the furnace be only somewhat above the desired tempera ture, contact 71 will be in engagement with contact 45, while contact 72 is still in engagement with contact 44:. This will cause both lamps w and 1* to glow, which will indicate, due to the fact that lamp 1" is glowing, that the temperature is too high, but the simultaneous glowing of lamp w will indicate that it is only slightly too high. However, if the disk 42 has been rotated by the automatic mechanism, due to still higher temperature,

with contact {48, while contact -71 is still engegementwith 'c'onta'ctAAQ 'Tllis willcause lamps b and w to glow, and so "indicate that the temperature is below normal or desired temperature. If, however, :the "temperature is far *below normal, the disk 42 is "In such position that botlflhrushes 7-1 and 72 'are in engagement with contact '43; whereby Iblue' lamp 1) "only is glowing, indicating a .temperature fa1"-b'elow normal."

"While'ithese operations of automatically controlling the temperature of theifurn'ac'e and 'dif indicatingits temperature are performed, an actual record of the temperature variations df the fiirna'ce F with time are produced by the marker 49 3 drawing an ink or pencil mark -88 upon the recorderf'aper P, which moves in "the direction ind cated bythe arrow. 5

While *in "connection with {the particular,

example of my invention described Ijrefer to employ a potentiomefierfin assoeiation with-"the fthermo=cougllef T, w'vill jibe undeirstdodthttt'tli'e couple 1 filmy-when able 'be I connected 'fdirectly I in 'series the gal-vanometer coil 2Q, independently of the potentiometer arrangement, though such connection "of the couple and galvanometer does "not ellect so nice a 'control "as i may be desired, particularly "hen the apparatus is also'emp'loyed'as 'a'recorder g In lieu of the thermo couple1T anyother suitable temperature responsive device, a resistance thermometer, maybe employed; andin-case a resistancethermomete'r is used it may be associated as well "understood in the art with the 'galvanomter coil ,20 and resistance ,R in a lvheatstonebritlgearrangement. *The'resistan'ce thermometer may for some purposes be connected in circuit with a suitable source of current and the galvanometerin-simplecircuit arrangement.

It will therefore be understood that inventionis not limited'to the particular ciron it arrangements. and devices employed, but

comprehends any suitable means "for cou' trolling the deflecting memben either of the galvanometer or any other suit-alile deflection instrument, whether electrical 'or mechanical, in response not only 'to temperature, but any otherchanging condition which it is desired to control or of Whose changes it is desired 'to give indications or a record.

While in the heating apparatus herein disclosed the heating agent is electrical energy, any other types of heater may be cen-v trolled, for example, those using :iiuid or gaseous fuel.

In lieu-of operating'as an auxiliary resister or 'burner, the member 76 may be the main or sole resistor or'burner oflalurnace or the like.

lVhilethere is herein disclosed apparatus for performing the three functions ofcontrol, indication and recording; it will he understood that my invention is not limited to the-arse {of all ,of them, b'u't 'co'mprehends either :ofthe controlling or indicating leatur'es sdlly "oriin eonibination, "and either o f the controlling or indicating features solely with "the'record in'g feature, or the contro lling',-intlicatingand recording features in'evnfiiination. *Whatlclaim is:

*l. Thirconihination witha deliecting'mem berg'of a source of wen a menlber adaptedto "produce a ange in the deflection of said deflecting member, said deflecting ditionto whiilh"said-deflecting member is respgnsii e 'farfd foriclontrolling' the ein cofirfirising ffiXd jand nio'tabl'e contacts r ena-a m vable I contactfisj'mo ed with sea second "named "Ifie'mher fby' (said source TD W v ar'frne eonlliinationflwith'a fieflectingmembenoi a 'sourceldf pfoWejr, member adapt.- etl'to produce fa change in ith'efde'flection of said deflecting member, saidjdeflect'ing member controlling actuation of said second named member by "said source of power, a heater, and means for controlling said heater icom'p'rising a third member actuated lo {said source of \power under'the control of said deflecting member.

'4. iTh'e combination with a deflecting'memher, a source of p0wer,.a meniberradapted to,produce a'change inthe deflection of said efleting member, said deflectingvmember co'ntrdlling actuation of said second named member by said source of power, a heater, and means for controlling the same comprisingifixed and ,moivable contacts, of which ,a movable contact is moved hysaid source .ofjaower under control :of said defleeting member.

'5. The combination withaldeilecting member, of asource of power, a .member adapt- 7 ed to ,produce a change inthe deflection-of said deflecting .member, said deflecting member controlling actuation ofsaid second named xmember Thy said source of power, a heater 'eliecting a change. of temperature to which said deflecting member is rresponsive, and means :for controlling said heater comprising a third member actuated by said source of power under theoontrol of said deflecting member. i

6. The combination with a deflecting member, of source of power, a member adapted to produce'a change in the'deflection of said deflecting member, said deflecting member controlling actuation of said second named member by said source of power, a heater effecting a change of'temperature' to which said deflecting member is responsive, and means for controlling the sameco'mprising fixed and movable conta cts, 'ofwhich a movable contact is moved by said source of power under control of said deflecting member. fl'

7. The combination with'a deflecting mem ber, of a source of power, a member adapted to produce a change in the deflection of said deflecting member, said deflectingineihber controlling actuation of said second named memberby said source of power, a translating device, means for C OIitlOlllIl'f" the same comprising fixed and movable con tacts of whicha movable contact: is moved; with said second named-member by jsaid sburce of power, indicatmgmeans, and means controlling the same comprising a thirdmember actuatedby said source of power under control of said deflecting member. 8. The combination with a deflecting member, of a source of'power, a memberiadapn ed to produce a change in the deflection of said deflecting member, said deflectingmember controlling actuation of said second named member by'said source of power, a translating device effecting a change of conditionto which said deflecting member is responsive, means for controlling the same comprising fixed and movable contacts of which a movable contact is moved with-said second. named member by. said source of power,'means for indicating acondition of said translating device comprising an indicator, and means controlling the same actuated by said source of power under control of said deflecting member. I I

9. The combination with a deflecting member, of a source of power, a member adapted to produce a change inthe deflection of said deflecting member, sa d deflecting member controlling actuation of said second named member by said source of power, a heater, means for controlling said heater comprising a third member actuated by said source of power under the control of said deflecting member, an indicator, and means for controlling the same actuated by said source of power under the control of said deflecting member. I

10. The combination with a deflecting member, ofa source of power, a member adapted to produce a change in the deflection of said deflecting member, said deflecting member-controlling actuation of said second named member by said source of power, a heater, means for controlling the same comprising fixed and movable contacts, of which a movable contact is moved by said source of 'power under control of said deflecting member, an indicator circuit, and contacting means controlling the same ctuated by said source of power under the control of said deflecting member.

- 11. The combination with a deflecting member, of a'source. of power, a member adapted to produce a change in the deflec tion of said deflecting member, said deflecting member controlling actuation of said "second named member by "said sour'ceof power, a heater effecting a change of temperature to whichsai'd deflecting member is responsive,me'ansjfor controlling said heater comprising a third member actuated by said source of power under the control of said deflecting membenm ans for indicating a "condition produced by said heater comprising ail-indicator, and means controlling the samea'ctuatedbysaid sourceof power under control oi said deflecting member.

""l2qThe combination with a deflecting member, of'a source ofpower, a member adapted to .produce'a'change in the deflection of said deflectingmemben'said deflecting member controlling'actuation of said second named member by said source of power, a heater eiiecting a change of temperature'towhich said "deflecting member is responsive, means for'controlling the same comprising fiized and movable contacts, of which a movable contact is moved by'said source of power under control of said-deflecting member, an indicator and its circuit for indicating a condition produced by said heater, and means 'for controlling said circuit actuatedby said source of power under control of said deflecting member.

13. The combination with a deflecting member, of a source of power, a memberadapted to produce a change 1n the deflection of said deflecting member, saiddefiecting member'controlling actuation ofsaid second named member by said source of'power, a translating device, means for controlling the same comprising fixed and movable contacts of which a movable contact is moved with said second named member by said source of power, and a recorder having a marker actuated by said source of power under control of said deflecting member.

14. The combination with a deflecting member, of a source of power, a member adapted to produce a change in the deflection of said deflecting member, said deflecting member controlling actuation of said second named member by said source of power, a translating device effecting a change of condition to which said deflecting member is re- .Whic

ated bysaid sonrceot power; under: control of. saiddeflecting member..

1.5.. The combination. with. a deflecting member, of. a source. of power,. a member adapted to. reduce achange in; the. deflection of said. deg member controlling actuation of: said. second named member. by said source. of). power, a heater, means for controlling said heater comprising, a. third member actuated. b.- Said sourceof power. nder. tbe oontrol 0 deflecting member andlai recorder having a marker. actuated! by said source of. power under controlL-of saiddeflectingmember 1.6.. The=. combination, with a deflecting member',, ofl a sonree-.-o-f.' power, a member adapted toroduceachangeinttliedeflection oi said, de fl ectiing member,, said deflecting .membencontro11ing,actuation otsaidlsecond named, member. by, said; source. oflpower' a heater eflecting. a change of temperature-to which said. deflecting, member is responsive,

meansQfor controlling saidiheaten compris' a. third. member actuated; by said source]: 0'

power. under. the,.c0nt1:0l ofi said: deflecting .member, and. a recorder. haying a marker actuated. b said. sourceofl ower. under. control of sai deflectingimem en.

1.7. The combination. with. a. deflecting member, of a. source. of power, a member adapted .to. producea changein the. deflection of said deflecting .member-, said. deflecting member controlling actuationof said second named. member by said sourceoi power, a translating. device,,means, for controllingthe same. comprisingfixed andmoyable. contacts of which. a movable contact is moved. with said second named member by said source of power, indicating, means, means controlling the same comprising athirdmember actuatedby said source. of power. under control of. said deflecting, member, and a recorder having: amarkenactuatedby, said source of power under control of said deflecting member.

18.. The combination, with a deflecting member, of. a source. of powser, a member adapted to-produce achangain the deflection oi said, deflectingmember, said deflecting member controlling actuationbf said second namedmcmber by said; Source of power, a translatingdeyice eflectinga changeof condition to which said deflectingmemberis re,- sponsive, means. foncontrolling the same comprising fixed and movable! contacts of which. a movablecontact is moved'with said second, named member by said source of power, means for indicating. a. condition of said.translating. device comprising an indicator, means controllin the same actuated ectingmember, deflecting said source. of power under control of said deflectingmembenand a-recorder having a marker actuated by said source of power undercontrolof said. deflecting member.

19.. The, combination, with a deflecting member,, of a. source. of power,- a member adapted; to. produce achange in. the deflection. of said deflecting, member, said deflecting member. controlling actuation. of said second named. member by said: source of power, a, heater,,means for controlling said heater comprising, aithird member actuated by source of. power-under. the control .of said deflecting; member, an indicator, means for controlling'the same actuatedby saidsouncemi power underthe. control of said deflecting, member and, a. recorder having a. manker" actuated by said! source of 13-. J "20.. Thecombination with. a. deflecting member, ofa source of power,.. a member adapted to.- produce achange: in thejdefleo 17 3 1 fI aid deflect' member, saiddefl'ectmembercontrb ifing actuation of said second named member by said source of power, a heater eifecting a change; of .temperatureto which said deflecting member is responsive, means? for controlling said heater comprising a, third member actuated by saidsource or power under the control of said deflecting member, means, for-indicatinga conditionproducedjby saidheater comprising an indicator, means controllingthe s me actuated'b s idsouree ot'pow r nder control of saidv eflflc'tingmember, and a recorder having "a1. marker, actuated by said source of'power under control of said deflect-ing m m e 4 21. The. combinationwith. a galvanometer having, a deflecting, member, a source of power, a member. adapted to roduce a change in the deflection of said galvanom etcr, said deflecting member controlling actuation of said second named member in opposite directions by said source. of power aceordin as said deflecting member deflects inone direction on the other, a translating device efiecting a change of condition to which said galvanometer is responsive, and means. for controlling said translating-device actuated by said'source of power under control of said deflecting member,

22. The combination with a galvanometer having a deflecting member, a source of power, a member adapted; to produce a change in the deflection of said galvanometer, said. deflecting member controlling actuation of said second named. member in opposite directions by said source of power according as said deflecting member deflects in one direction 0. the other, a heater, means responsive to temperature changes produced ter, and means controlling said heater actuated by said source ofpower under control ofsaid deflecting member.

23. The combination with a galvanometer having a deflecting member, a source of power, a member adapted to produce a change in the deflection of said galvanometer, said deflecting member controlling actuation of said, second namedfmember. in opposite dlrectlons' by said source of power according as said deflecting memberdeflects in one dlrection or the'other, a translating device effecting a change of condition to which said galvanometer is.' responsive, means for controlling said translating device actuated b said source of power under control of sald deflecting member, indicating means, and means controlling the same actuated by said source of power under control of said deflecting member.

24. The combination with a galvanometer having, a deflecting member,- a source of power, a member adapted to produce a change in the deflection of saidgalvanometer, said deflecting *inember 'fcontrolling actuation of said second named member *in opposite directions b" said. source of power according as said'de ecting'memb'er deflects in one direction or theiothena' heater, means responsive to temperature changes produced by said heater controlling said galvanonieter, means controlling said heater actuated by'said source of power under control of said deflecting member, indicating means, and means controlling the same actuated'by said source of power under control'o'fsaid deflecting member. I

25. The'combination with a galvanometer havingadeflectingmember,- a sourceo'f power, a member adapted to "producea change in thedeflection of said galvanometer, said deflecting member controlling actuation of said second named member in opposite directions by said source of power according as said deflectingmember deflects in one direction or the other, a translating device effecting a change of condition to which said galvanometer is responsive, means for controlling said translating device actuated by said sourceof power under control of said deflecting member, and a recorder having a marker actuated by said source of power under control of said de fleeting member.

26. The combination with a galvanometer having a deflecting member, a source of power, a member adapted to produce a change in the deflection of said galvanometer, said deflecting member controlling actuation of said second named member in opposite directions by said source of power according as said deflecting member deflects in one direction or the other, a heater, means responsive to temperature changes produced by said heater controlling sald galvanometer, means controlling said heater actuated by said source of power under control of said deflecting member, and a recorder having a marker actuated by said source of power undercontrol of said defleeting member.

2.7; The combination with a galvanometer having a deflecting member, a source of power, a member adapted to produce a change in the deflection of said galvanometer, said deflecting member controlling actuation of said second" named member in op' posite directions by' said source of power according as said deflecting member deflects in one directionor'the-other, a translating device efiecting a change of condition to which said galvanoineter is responsive, means for" controlling'said translating device'actuated by said [source of power under control of saiddeflec'ting member, indicating means, means eentmni gj the same actuated by said'fsou rce' off fpower under control of said deflecting 'men ber,andfa recorder havinga .marlr'er tuated'f by said source of pow under control of 'said deflecting mem- I 1;. V: .-l H "1428'. The combination with a galvanorneter having a deflecting member, a source of power, a member adapted to produce "a change inthe deflection of s'aidgalvanometer, said deflecting membencontrolling actuation o f'said second named member in opposite directions said so urce of power according saidfd eflecting member defleets inione di'r'ection or the other, a heater, means responsive to temperature changes produced said heater-controlling' said galvanometer, means controlling saidheater actuated by. saidsource of'poiver under control of said deflecting membe'r, indicating means,'means,controlling the same actuated by said source of power under control -of said deflecting member, and a recorder having a marker actuated by said source of power under control of said deflecting 'member; f i

29. The combination'w'ith a heating de;

vice, of means responsive to the'temp'erature thereof, recording mechanism controlled by said means, and a controller for said heater comprising means actuated in unison wit the marker'of said recorder. 30 The combinationwith a heating device, of means responsive to the temperature thereof, recording mechanism controlled by said means, a controller for said heater comprising means actuated in unison with the ma ker'of said recorder, means for indicating the temperature resulting from control of said heater comprising an indicator, and a controller therefor moving in unison with the marker of said recorder.

'31. The combination with a member capaole of deflecting in opposite directions, of a source of power, a member adapted to protion; tov which. saiddeflec ting. member. is responsive, a plurality of electrmmagnetic windings, and. fined and moi-table contact structure controlling said. windings; the movable. structure. of. said contact structure actuatedby said source fipowenunder con.- trol. of said. defiectingmemhen.

- 32. The, combination with. a member. capable. of deflecting inopposite directions, of a source. ct powen; a! member. adapted. to produce. a; change. in the deflection 01",. said deflecting member and actuated: by. said source of power under. control of. saidP defleetingmember, means. eflecting a change of condition to which said defi'ectingmemher: is responsive, a plurality of indicators, and. contact structure; controlling the. same, the movable. structure. of said, contact; strucr tiu'e actuated by, said source. o;tpower -under control of said deflecting member U he i t n :i h. a. m mberjcepable of deflecting in opposite directions, of a source of power, amember adaptedtoproduce achan'ge in the deflectionof said defleeting member and actuated by said'sonrce of power under control. of said deflecting memben, means effecting. achange ofcondition to. which said deflecting. member is responsive, a plurality of indicators, and contact structure controlling the same actuated by said source of power under control of said deflecting member to, indicate in which direction said deflecting member has deflected.

34. The combination with a member capable of deflecting in opposite directions, of a source of power, a: member adapted to produce a change in the deflection of said deflecting member and actuated. by said source of power under control of said defleeting member, means effecting a change of condition to which said deflecting member is responsive, a plurality of indicators, and contact structure controlling the same actuated by said. source of power under'control of said deflecting member toindicate when said deflecting member is in normal position and when slightly. deflected.

35. The combination with a galvanometer having a member deflecting in opposite directions, of a source of power, electrical means controlling said galvanometer, said means comprising means variable by said source of power under control of saiddeflecting member of said galvanometer, means cooperating with said second: named means in controlling said galvanometer, and means for controlling said lastnamed means actuated by saidsource 0t power under-control of said deflecting member.

36. The combination with a galvanometer havingia member. deflecting in opposite di-r rections, oi. a. source. oi; power, electrical means controllingsaid ga lmw lmfiter, said means comprieingmeans variable-by said source. oi powerunder. vcontnel 0t said defleeting. membe r. at .said galvanometen, meanscoopcrating. with said second named means'in. contnoliing said, galvanometer, a

plurality. of indicatorsf ion indicating; when said; defiecting member isin-nonmalposition or. toeither. thereoi, and. a. plunaiity. or contacts torhcontrolling said. indicators, conr trolled hynsaidsonrce of power under. con.- trol oisaid deflecting-,-memher. a V

source 0t. powengunder. control; of said deflecting. -member oi said galyanometer, means coiiperating with said second named means in controlling saidgalvanometer, a plnrali-ty oi indiQators for, indicating when said deflecting member isin normal position or toeither side thereoi, a plurality of contacts for controlling said. indicators controlled. by saidsource. of. power. under control of saiddeflecting member, and a marker actuated by. said. source of power under control of said deflecting-member.

39.."Lhecombination with a deflecting member, of a; source of power, a member adapted. to produce a change in the deflection: of said. deflecting member actuated by said source. of power under. control of said deflecting. member, a translating device, means responsive-to changes in condition of said translating device controlling said deflecting member, indicating means, means actuatedby said source of power under control. of said deflecting member operating said indicating means, and means. actuated by said source of power under control of said deflectingmeans effecting changes in condition .ot said. translating device.-

40.. The combination. with a deflecting member, of a. source of power, a translating device, said, deflecting member responsive to changes in condition of said translating device, an indicator, and means operated by said source of power under control of said deflecting member controlling said indicator.

41. The combination with a deflecting member, of a source of power, a translating device, said deflecting member responsive to changes in condition of said translating device, an indicator, means actuated by said source of power under control of said defleeting member controlling said indicator, and means actuated by said source of power under control of saiddeflecting member controlling said translating device.

42. The combination with a deflecting member, of a motor, a translating device eflecting changes of condition to which said deflecting device is responsive, means for controlling said translating device comprising fixed and movable contacts, and motion transmitting mechanism under control of said deflecting member for moving said movable contact by said motor.

43. The combination with a device responsive to changes in acondition, of a structure movable under control of said device, means for indicating the condition to which said device is responsive, and means controlling said last named means comprising a fixed contact and a plurality of movable contacts, said movable contacts carried by said structure.

44. The combination with a temperature responsive device, of a structure movable under control of said device, contacts carried by said structure comprising two long contact members and an intermediate short contact member, indicating devices connected to each of said contact members, and a fixed contact connected with said indicatin means and in cooperative relation with said movable contact members, said fixed contact engaging said intermediate contact member or one or the other of said long contact members when the temperature is normal or above or below normal, respectively.

4:5. The combination with a temperature responsive device, of a structure movable under control of said device, a series of contact members carried by said structure, a fixed contact adapted to engage one of said contact members or two of said contact members, a series of electrical circuits each of which includes said fixed contacts and one of said contact members, and a lamp in each electrical circuit.

46. The combination with a galvanometer having a deflecting member, of a source of power, a movable structure actuated by said source of power under control of said deflecting member, an electrical circuit including a variable resistance controlling deflection of said deflecting member, said variable resistance carried by said movable structure, a second electrical circuit electrically independent of said first named electrical circuit, and switching means carried by said movable structure controlling said second electrical circuit.

In testimony whereof I have hereunto affixed my signature this 11th day of February, 1919.

HENRY BREWER. 

